Posterior interosseous nerve

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Nerve: Posterior interosseous nerve
The Supinator. (Dorsal interosseous nerve labeled at right.)
Latin nervus interosseus antebrachii posterior
Gray's subject #210 944
Innervates    Extensor carpi radialis brevis

Extensor digitorum
Extensor digiti minimi
extensor carpi ulnaris
Supinator muscle
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Extensor indicis

From deep branch of the radial nerve
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The posterior interosseous nerve (or dorsal interosseous nerve) is a nerve in the foream. It is the continuation of the deep branch of the radial nerve, after this has crossed the supinator muscle. It is considerably diminished in size compared to the deep branch of the radial nerve. The nerve fibers originate from cervical segments C7 and C8.


It descends on the interosseous membrane, in front of the Extensor pollicis longus, to the back of the carpus, where it presents a gangliform enlargement from which filaments are distributed to the ligaments and articulations of the carpus.


It supplies all the muscles on the radial side and dorsal surface of the forearm, excepting the Anconæus, Brachioradialis, and Extensor carpi radialis longus. In other words, it supplies the following muscles:

See also

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.